'use strict';

const fs = require('fs')
const path = require('path')

const inquirer = require('inquirer')
const fse = require('fs-extra')
const glob = require('glob')
const ejs = require('ejs')
const semver = require('semver')
const userHome = require('user-home')

const Command = require('@alic-cli-dev/command')
const log = require('@alic-cli-dev/log')
const Package = require('@alic-cli-dev/package')
const { spinnerStart, execAsync } = require('@alic-cli-dev/utils')
const getProjectTemplate = require('./getProjectTemplate')

const TYPE_PROJECT = 'project'
const TYPE_COMPONENT = 'component'

const TEMPLATE_TYPE_NORMAL = 'normal'
const TEMPLATE_TYPE_CUSTOM = 'custom'

const WHITE_COMMAND = ['npm', 'cnpm'];
class InitCommand extends Command {
    init() {
        this.projectName = this._argv[0] || ''
        this.force = !!this.cmd.force
        log.verbose('projectName', this.projectName)
        log.verbose('force', this.force)
    }
    async exec() {
        try {
            let projectInfo = await this.prepare()
            if(projectInfo) {
                log.verbose('projectInfo', projectInfo)
                this.projectInfo = projectInfo
                await this.downloadTemplate()
                await this.installTemplate()
            }
        } catch(e) {
            log.error(e.message)
        }
        
    }
    async prepare() {
        const template = await getProjectTemplate()
        if(!template || template.length === 0) {
            throw new Error('项目模板不存在！')
        }
        this.template = template
        const localPath = process.cwd()
        log.verbose('localPath', localPath)
        if(!this.isDirEmpty(localPath)) {
            let ifContinue = false
            if(!this.force) {
                ifContinue = (await inquirer.prompt({
                    type: 'confirm',
                    name: 'ifContinue',
                    default: false,
                    message: '当前文件夹不为空，是否继续创建项目？'
                })).ifContinue
                if(!ifContinue) return
            }
            if(ifContinue || this.force) {
                const { confirmDelete } = await inquirer.prompt({
                    type: 'confirm',
                    name: 'confirmDelete',
                    default: false,
                    message: '是否确认清空当前目录下的文件？'
                })
                // if(!confirmDelete) return
                if(confirmDelete) {
                    fse.emptyDirSync(localPath)
                }
            }
        }
        return await this.getProjectInfo()
    }

    async getProjectInfo() {
        function isValidName (v) {
            return /^[a-zA-z]+([-][a-zA-Z][a-zA-Z0-9]*|[_][a-zA-Z][a-zA-Z]*|[a-zA-Z0-9]*$)/.test(v)
        }
        let projectInfo = {}
        let isProjectNameValid = false
        if(isValidName(this.projectName)) {
            isProjectNameValid = true
            projectInfo.projectName = this.projectName
        }
        const { type } = await inquirer.prompt({
            type: 'list',
            name: 'type',
            message: '请选择初始化类型',
            default: TYPE_PROJECT,
            choices: [{
                name: '项目',
                value: TYPE_PROJECT
            }, {
                name: '组件',
                value: TYPE_COMPONENT
            }]
        })
        log.verbose('type', type)
        const title = type === TYPE_PROJECT ? '项目' : '组件';
        this.template = this.template.filter(template => template.tag.includes(type))
        const projectNamePrompt = []
        if(!isProjectNameValid) {
            projectNamePrompt.push({
                type: 'input',
                name: 'projectName',
                message: `请输入${title}名称`,
                default: '',
                validate: function(v) {
                    const done = this.async();
                    setTimeout(function(){
                        // 1. 输入的首字符必须为英文字符
                        // 2. 尾字符必须为英文或数字，不能为字符
                        // 3. 字符仅允许 "-_" a-b a_b aaa bbb
                        if (!isValidName(v)) {
                            done(`请输入合法的${title}名称`);
                            return;
                        }
                        done(null, true);
                    }, 0);
                },
                filter: function(v) {
                    return v
                }
            })
        }
        projectNamePrompt.push({
            type: 'input',
            name: 'projectVersion',
            message: `请输入${title}版本号`,
            default: '0.0.0',
            validate: function(v) {
                const done = this.async();
                setTimeout(function(){
                    if (!(!!semver.valid(v))) {
                        done('请输入合法的版本号');
                        return;
                    }
                    done(null, true);
                }, 0);
                // return !!semver.valid(v);
            },
            filter: function(v) {
                if(!!semver.valid(v)) {
                    return semver.valid(v)
                } else {
                    return v
                }
            }
        }, {
            type: 'list',
            name: 'projectTemplate',
            message: `请输入${title}模板`,
            choices: this.createTemplateChoice()
        })
        
        if(type === TYPE_PROJECT) {
            const project = await inquirer.prompt(projectNamePrompt)
            projectInfo = {
                ...projectInfo,
                type,
                ...project
            }
        } else if(type === TYPE_COMPONENT) {
            const descriptionPrompt = {
                type: 'input',
                name: 'componentDescription',
                message: '请输入组件描述信息',
                default: '',
                validate: function(v) {
                    const done = this.async();
                    setTimeout(function(){
                        if (!v) {
                            done('请输入组件描述信息');
                            return;
                        }
                        done(null, true);
                    }, 0);
                }
            }
            projectNamePrompt.push(descriptionPrompt)
            const project = await inquirer.prompt(projectNamePrompt)
            projectInfo = {
                ...projectInfo,
                type,
                ...project
            }
        }
        if(projectInfo.projectName) {
            projectInfo.name = projectInfo.projectName
            projectInfo.className = require('kebab-case')(projectInfo.projectName).replace(/^-/, '')
        }
        if(projectInfo.projectVersion) {
            projectInfo.version = projectInfo.projectVersion
        }
        if(projectInfo.componentDescription) {
            projectInfo.description = projectInfo.componentDescription
        }
        return projectInfo;
    }

    async downloadTemplate() {
        // 1. 通过项目模板API获取项目模板信息
        // 1.1 通过egg.js搭建一套后端系统
        // 1.2 通过 npm 存储项目模板（vue-cli/vue-element-admin）
        // 1.3 将项目模板信息存储到mongodb数据库中
        // 1.4 通过 egg.js 获取 mongodb 中的数据并且通过API返回
        const { projectTemplate } = this.projectInfo
        const templateInfo = this.template.find(item => item.npmName === projectTemplate)
        const targetPath = path.resolve(process.env.CLI_HOME_PATH, 'template')
        const storeDir = path.resolve(process.env.CLI_HOME_PATH, 'template', 'node_modules')
        const { npmName, version } = templateInfo
        this.templateInfo = templateInfo
        const templateNpm = new Package({
            targetPath,
            storeDir,
            packageName: npmName,
            packageVersion: version
        })
        if(!await templateNpm.exists()) {
            const spinner = spinnerStart('正在下载模板...')
            try {
                await templateNpm.install()
            } catch(e) {
                throw e
            } finally {
                spinner.stop(true)
                if (await templateNpm.exists()) {
                    log.success('下载模板成功！');
                    this.templateNpm = templateNpm;
                }
            }
        } else {
            const spinner = spinnerStart('正在更新模板...')
            try {
                await templateNpm.update()
            } catch(e) {
                throw e
            } finally {
                spinner.stop(true)
                if (await templateNpm.exists()) {
                    log.success('更新模板成功！');
                    this.templateNpm = templateNpm;
                }
            }
        }
    }
    async installTemplate() {
        if(this.templateInfo) {
            if (!this.templateInfo.type) {
                this.templateInfo.type = TEMPLATE_TYPE_NORMAL;
            }
            if (this.templateInfo.type === TEMPLATE_TYPE_NORMAL) {
                // 标准安装
                await this.installNormalTemplate();
            } else if (this.templateInfo.type === TEMPLATE_TYPE_CUSTOM) {
                // 自定义安装
                await this.installCustomTemplate();
            } else {
                throw new Error('无法识别项目模板类型!');
            }
        } else {
            throw new Error('项目模板信息不存在！')
        }
    }
    async installNormalTemplate() {
        log.verbose('templateNpm', this.templateNpm);
        // 拷贝模板代码至当前目录
        let spinner = spinnerStart('正在安装模板...');
        try {
            const templatePath = path.resolve(this.templateNpm.cacheFilePath, 'template');
            const targetPath = process.cwd();
            fse.ensureDirSync(templatePath);
            fse.ensureDirSync(targetPath);
            fse.copySync(templatePath, targetPath);
        }catch(e){
            throw e;
        } finally {
            spinner.stop(true);
            log.success('模板安装成功！');
        }
        const templateIgnore = this.templateInfo.ignore || [];
        const ignore = ['**/node_modules/**', ...templateIgnore];
        await this.ejsRender({ ignore });
        const { installCommand, startCommand } = this.templateInfo;
        // 依赖安装
        await this.execCommand(installCommand, '依赖安装失败！');
        // 启动命令执行
        await this.execCommand(startCommand, '启动执行命令失败！');
    }
    async installCustomTemplate() {
        // 查询自定义模板的入口文件
        if (await this.templateNpm.exists()) {
            const rootFile = this.templateNpm.getRootFilePath();
            if (fs.existsSync(rootFile)) {
                log.notice('开始执行自定义模板');
                const templatePath = path.resolve(this.templateNpm.cacheFilePath, 'template');
                const options = {
                    templateInfo: this.templateInfo,
                    projectInfo: this.projectInfo,
                    sourcePath: templatePath,
                    targetPath: process.cwd(),
                };
                const code = `require('${rootFile}')(${JSON.stringify(options)})`;
                log.verbose('code', code);
                await execAsync('node', ['-e', code], {stdio: 'inherit', cwd: process.cwd()});
                log.success('自定义模板安装成功');
            } else {
                throw new Error('自定义模板入口文件不存在！');
            }
        }
    }

    async execCommand (command, errMsg) {
        let ret;
        if (command) {
            const cmdArray = command.split(' ');
            const cmd = this.checkCommand(cmdArray[0]);
            if (!cmd) {
                throw new Error('命令不存在！命令：' + command);
            }
            const args = cmdArray.slice(1);
            ret = await execAsync(cmd, args, {
                stdio: 'inherit',
                cwd: process.cwd(),
            });
        }
        if (ret !== 0) {
            throw new Error(errMsg);
        }
        return ret;
    }
    checkCommand (cmd) {
        if(WHITE_COMMAND.includes(cmd)){
            return cmd;
        }
        return null;
    }

    async ejsRender({ignore}) {
        const dir = process.cwd()
        const projectInfo = this.projectInfo
        return new Promise((resolve, reject) => {
            glob('**', {
                cwd: dir,
                ignore,
                nodir: true
            }, (err, files) => {
                if(err) {
                    reject(err)
                }
                if(files) {
                    Promise.all(files.map(file => {
                        const filePath = path.join(dir, file)
                        return new Promise((res1, rej1) => {
                            ejs.renderFile(filePath, projectInfo, {}, (err, result) => {
                                if(err) {
                                    rej1(err)
                                } else {
                                    fse.writeFileSync(filePath, result)
                                    res1(result)
                                }
                            })
                        })
                    })).then(() => {
                        resolve()
                    }).catch(e => {
                        reject(e)
                    })
                }
            })
        })
    }
    createTemplateChoice() {
        return this.template.map(item => ({
            value: item.npmName,
            name: item.name
        }))
    }
    isDirEmpty(localPath) {
        let fileList = fs.readdirSync(localPath)
        fileList = fileList.filter(file => (
            !file.startsWith('.') && ['node_modules'].indexOf(file) < 0
        ))
        return !fileList || fileList.length <= 0
    }

}

function init(argv) {
    return new InitCommand(argv)
}

module.exports = init
module.exports.InitCommand = InitCommand;